ROUGH IDLE (HIGH THEN LOW RPMS) AND SURGES OR LURCHES WHEN COASTING. HOOD WONT OPEN
1995 Volkswagen GTI
August, 16, 2012 AT 9:30 PM
My 95 GTI VR6 has about 60k on engine and 193 on tranny/car. It starts up great, but sometimes idles up and down in rpms while sitting still. It drives okay in lower speeds and shifts smoothly, but when I let off gas to coast, it lurches. When I push on the gas or depress the clutch, it goes away. Happens in 1st, 2nd, 3rd. I have only had the car for a few months and dont drive it much, but it didnt do that the first few weeks (it wasnt 90 to 100 degrees then either, in case thats a factor.) Everything else seems to be working fine. My thoughts go to a bad ECM / ECU, a leak in vacuum somewhere, or some Idle control valve, etc. Unfortunately, the hood cable is broken and cant get into engine to take a look.
Try cleaning the throttle plate on both sides with chokeor fuel injector spray clener. Wipe it all out if you cansee if that helps.
August, 18, 2012 AT 6:03 AM
Thanks, I will try that. Not exactly sure where that is, but can figure it out most likely. I finally got the hood to unlatch. I also found that the hose leading into the air filter box is cracked open. Could this be part of the problem (even though its not cold outside) I will replace it too.
August, 18, 2012 AT 12:50 PM
The throttle plate is at the end of your air duct going to the motor. Make sure to hook up air duct before starting car.
August, 18, 2012 AT 6:33 PM
'95 Throttle Body should be non-motorized and closes 100% when at
idle (no air past throttle plate).
The Idle Air Valve is used to bypass air around the throttle body
for Idle purposes.
A scan of ECM data via VCDS would be the best way to track down what
is going on (fault codes, fuel trim correction etc).
August, 18, 2012 AT 11:02 PM
This type of situation won't appear as a fault code because the computer thinks it's working.
August, 18, 2012 AT 11:38 PM
I beg to differ. "Idle Control" faults are common. Idle regulation
faults (Idle to High, Idle too low) will be flagged if there is an
Even if no code is stored. A scan tool can be of help, by viewing
August, 18, 2012 AT 11:44 PM
True if a pro does this, not your average person that emails in to get some type of answer. Most of the people don't even have a scanner let alone how to u se one.
August, 18, 2012 AT 11:51 PM
I am merely providing info. Just like you with your cleaning of